摘要: The reverse circulation drilling technology is that drilling fluidis pumped down to the annulus, through drill bit and inside ofthe drilling tool, comes back to the ground. It has manyadvantages, such as reducing the formation lea... 展开 The reverse circulation drilling technology is that drilling fluidis pumped down to the annulus, through drill bit and inside ofthe drilling tool, comes back to the ground. It has manyadvantages, such as reducing the formation leakage, protectingthe oil and gas formation, and cutting sample very clear etc. Itincludes air lifting, air and pump sucking reverse circulationdrilling. Air lifting reverse circulation drilling needs aircompressor, air tank, air box, double wall drill tool, air mixerand reverse drilling bit etc. By applying the original drillingrig, these equipments are connected to drill string and carriedout the drilling work, after finishing drilling work, theseequipments can be removed totally, and have no influence tothe normal drilling work. Through testing and on-siteapplication, these equipments are coordinative, drilled 400min the leaking formation and got a better effect. 收起